Douglass was the acknowdedged black leader of his time.
道格拉斯是那时公认的黑人领袖。
Douglass, Frederick. What to the Slave is the Fourth of July 1852.
弗雷德里克道格拉斯著7月4日对黑奴有何意义，1852。
The black antislavery activist Frederick Douglass praised the song.
反奴隶制黑人活动家弗雷德里克道格拉斯赞扬了这首歌曲
North, Douglass. Institutions, Institutional Change and Economic Performance.
道格拉斯。斯，制度，度变迁与经济成就。
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